Having been to the UK and seen real medieval castles its interesting to see the evolution of fortifications and specifically how fortresses were adapted to North America from European designs. Obviously we don't have castles here but Fort Ticonderoga and Castillo de San Marcos in St Augustine in Florida are the closest thing.

Also interesting to note the reasons the fort was built the way it was, where it was situated and how many times it changed hands. How it was originally designed to guard against British excursions heading north on Lake Champlain, then protect facing north when the British held it, then how the guns were hauled to Boston to force the British out during the Revolutionary War.

It's important to note that it was reconstructed in the early portion of the 20th century and that it was restored to the intended plans of the French and British, not how it actually looked from 1753-1777.